Advantages and disadvantages for ms-NoVent

[jimmyhu]

The SGE sells ms-NoVent device that allows the MS to be operational almost immediately; results in minutes rather than in many hours or even days, depending on the sensitivity required from the instrument. It costs about US$1,000.

Is it widely used by GCMS analysts? What are the advantages and disadvantages for this device?

Any help would be greatly appreciated!

Jimmy

[Answer Man]

Jimmy: I cannot help you with the SGE ms-NoVent, but I thought I would mention the Restek EZ No-Vent ($175 US), another common product for your application. I have attached a link which should explain the pro's and con's of this product. They work well, but they do allow a small volume of air into the MS (through a small 0.1mmID transferline). In addition, because of the transferline, your carrier gas pressure program will need to be modified (increased) to compensate for this restriction.

http://www.restek.com/fantasia/pdfCache ... 890-16.pdf

[Consumer Products Guy]

I've had both in my lab and I like the Restek EZ No-Vent better, it's simpler as well. I did find the directions on "how much column end should protrude" a little unclear (but I'm not a rocket scientist), but it does work, and we don't get any air peaks due to leaking. We're using it now.